A documentary filmmaker turns his lens on an enigmatic conspiracy theorist who claims he's found the entrance to a vast underground city populated entirely by monsters.
| Actor | Role |
|---|---|
 Ray WiseWilliam Dekker | William Dekker |
 Adam GreenSelf | Self |
 Kane HodderSelf | Self |
 Mick GarrisSelf | Self |
 Rileah VanderbiltSelf | Self |
 Josh EthierSelf / Vance / Little Bigfoot | Self / Vance / Little Bigfoot |
 Tom HollandHimself | Himself |
 Sarah ElbertSelf | Self |
| AAlex PardeeSelf / Park Ranger | Self / Park Ranger |
| NNic HenleyHarlequin | Harlequin |
| CCaitlyn BrisbinTombstone | Tombstone |
| RRobert PendergraftShadow | Shadow |
 Steve AgeeSelf | Self |
 Steven BartonSelf | Self |
| DDave BrockieOderus Urungus | Oderus Urungus |
 Don CoscarelliSelf | Self |
 Evan DicksonSelf | Self |
 Corri EnglishSelf | Self |
| AArwen GreenSelf | Self |
 Lloyd KaufmanSelf | Self |
 Joe LynchSelf | Self |
 Laura OrtizSelf | Self |
 Tony ToddSelf | Self |